Method and installation for the electrolytic production of liquid hydrogen

A method (100) for the electrolytic production of a liquid hydrogen product (4), comprising:

• subjecting a water-containing feed to electrolysis (E) while receiving an anode raw gas (3), rich in oxygen and containing hydrogen, and a cathode raw gas (2) which is depleted of oxygen and rich in hydrogen, wherein the electrolysis (E) is carried out, in parallel, at two different pressure levels, a higher pressure level and a lower pressure level, to produce a first cathode raw gas produced by the electrolysis at the higher pressure level and a second cathode raw gas produced by the electrolysis at the lower pressure level,
• wherein, downstream of the electrolysis (E), the first cathode raw gas and the second cathode raw gas are each subjected to purification (R), compression (K), and a liquefaction (L),
• wherein, downstream of the electrolysis (E) and upstream of liquefaction (L), the first cathode raw gas produced by the electrolysis at the higher pressure level is subjected at least partially to intermediate storage (Z), and
• the second cathode raw gas produced by the electrolysis at the lower pressure level is not subjected to intermediate storage (Z).